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As ridiculous as it sounds, most computer components such as the motherboard, PSU and certain expansion cards can survive a full dishwasher cycle. Obviously that's not how I recommend cleaning a PC. The following 8-year old video is an example. The internals were covered in cigarette smoke residue, so he decided to dismantle the components and put them through the dish washer, with the exception of the case, battery and the hard disk. I also enjoy watching videos on old hardware such as restoration videos. I have come ones where such hobbyists put components through a dishwasher cycle to clean extensive debris build-up from being left for 10+ years in storage such as a dusty shed. As long as no moisture remains when the PC is powered up, it should be fine. I generally clean my PC with an air duster, which is basically an aerosol can filled with propellant gas. Here in Ireland, humidity is usually on the high side, e.g. I run a dehumidifier to keep the indoor level below 60%. The only component I may wash is the keyboard. I have a Corsair Cherry Red Mechanical keyboard that I accidentally knocked a glass of cider on. I immediately unplugged it, tried wiping off what I could and let it dry. Once dry, many of the letters were sticking. When I started removing the keys to try cleaning below, I realised the mechanical switches were jamming. With what appeared to be a ruined keyboard that I only purchased a few months before the incident, I figured I'll try giving it a bath as we don't have a dishwasher. I partially filled a wide container with water from our dehumidifier (since it's effectively distilled), soaked the keyboard and pushed each key multiples times to force water through the switches. I left it to dry for about a week. It's fully functional again, all keys work and no sticking or other issue since.